AMD has just put out their Catalyst 10.5 Linux driver update. Unfortunately, there isn't anything too exciting in this release.
Officially, the only new feature in Catalyst 10.5 for Linux is "early look" support for SUSE Linux Enterprise Desktop / SUSE Linux Enterprise Server 11 Service Pack 1. There are, however, resolved issues pertaining to Hybrid CrossFire, kernel panics on hibernation, and suspend-and-resume fixes.
There is already some initial driver feedback
(download links and release notes can also be found in these posts) on the Catalyst 10.5 release with mixed thoughts -- some are reporting improvements for some games under Wine while others continue to run into problems with XvBA/VA-API and the Direct2D Linux acceleration
Fetch the proprietary ATI Catalyst 10.5 driver for Linux at AMD.com